[Mesa-dev] [PATCH 6/9] drm/i915/uapi: implement object placement extension
Matthew Auld
matthew.auld at intel.com
Mon Apr 26 09:38:58 UTC 2021
Add new extension to support setting an immutable-priority-list of
potential placements, at creation time.
If we use the normal gem_create or gem_create_ext without the
extensions/placements then we still get the old behaviour with only
placing the object in system memory.
v2(Daniel & Jason):
- Add a bunch of kernel-doc
- Simplify design for placements extension
Testcase: igt/gem_create/create-ext-placement-sanity-check
Testcase: igt/gem_create/create-ext-placement-each
Testcase: igt/gem_create/create-ext-placement-all
Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Signed-off-by: CQ Tang <cq.tang at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: Lionel Landwerlin <lionel.g.landwerlin at linux.intel.com>
Cc: Jordan Justen <jordan.l.justen at intel.com>
Cc: Daniel Vetter <daniel.vetter at intel.com>
Cc: Kenneth Graunke <kenneth at whitecape.org>
Cc: Jason Ekstrand <jason at jlekstrand.net>
Cc: Dave Airlie <airlied at gmail.com>
Cc: dri-devel at lists.freedesktop.org
Cc: mesa-dev at lists.freedesktop.org
---
drivers/gpu/drm/i915/gem/i915_gem_create.c | 215 ++++++++++++++++--
drivers/gpu/drm/i915/gem/i915_gem_object.c | 3 +
.../gpu/drm/i915/gem/i915_gem_object_types.h | 6 +
.../drm/i915/gem/selftests/i915_gem_mman.c | 26 +++
drivers/gpu/drm/i915/intel_memory_region.c | 16 ++
drivers/gpu/drm/i915/intel_memory_region.h | 4 +
include/uapi/drm/i915_drm.h | 62 +++++
7 files changed, 315 insertions(+), 17 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_create.c b/drivers/gpu/drm/i915/gem/i915_gem_create.c
index 90e9eb6601b5..895f1666a8d3 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_create.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_create.c
@@ -4,12 +4,47 @@
*/
#include "gem/i915_gem_ioctls.h"
+#include "gem/i915_gem_lmem.h"
#include "gem/i915_gem_region.h"
#include "i915_drv.h"
#include "i915_trace.h"
#include "i915_user_extensions.h"
+static u32 object_max_page_size(struct drm_i915_gem_object *obj)
+{
+ u32 max_page_size = 0;
+ int i;
+
+ for (i = 0; i < obj->mm.n_placements; i++) {
+ struct intel_memory_region *mr = obj->mm.placements[i];
+
+ GEM_BUG_ON(!is_power_of_2(mr->min_page_size));
+ max_page_size = max_t(u32, max_page_size, mr->min_page_size);
+ }
+
+ GEM_BUG_ON(!max_page_size);
+ return max_page_size;
+}
+
+static void object_set_placements(struct drm_i915_gem_object *obj,
+ struct intel_memory_region **placements,
+ unsigned int n_placements)
+{
+ GEM_BUG_ON(!n_placements);
+
+ if (n_placements == 1) {
+ struct intel_memory_region *mr = placements[0];
+ struct drm_i915_private *i915 = mr->i915;
+
+ obj->mm.placements = &i915->mm.regions[mr->id];
+ obj->mm.n_placements = 1;
+ } else {
+ obj->mm.placements = placements;
+ obj->mm.n_placements = n_placements;
+ }
+}
+
static int i915_gem_publish(struct drm_i915_gem_object *obj,
struct drm_file *file,
u64 *size_p,
@@ -29,14 +64,12 @@ static int i915_gem_publish(struct drm_i915_gem_object *obj,
}
static int
-i915_gem_setup(struct drm_i915_gem_object *obj,
- struct intel_memory_region *mr,
- u64 size)
+i915_gem_setup(struct drm_i915_gem_object *obj, u64 size)
{
+ struct intel_memory_region *mr = obj->mm.placements[0];
int ret;
- GEM_BUG_ON(!is_power_of_2(mr->min_page_size));
- size = round_up(size, mr->min_page_size);
+ size = round_up(size, object_max_page_size(obj));
if (size == 0)
return -EINVAL;
@@ -53,6 +86,7 @@ i915_gem_setup(struct drm_i915_gem_object *obj,
GEM_BUG_ON(size != obj->base.size);
trace_i915_gem_object_create(obj);
+
return 0;
}
@@ -62,6 +96,7 @@ i915_gem_dumb_create(struct drm_file *file,
struct drm_mode_create_dumb *args)
{
struct drm_i915_gem_object *obj;
+ struct intel_memory_region *mr;
enum intel_memory_type mem_type;
int cpp = DIV_ROUND_UP(args->bpp, 8);
u32 format;
@@ -102,10 +137,10 @@ i915_gem_dumb_create(struct drm_file *file,
if (!obj)
return -ENOMEM;
- ret = i915_gem_setup(obj,
- intel_memory_region_by_type(to_i915(dev),
- mem_type),
- args->size);
+ mr = intel_memory_region_by_type(to_i915(dev), mem_type);
+ object_set_placements(obj, &mr, 1);
+
+ ret = i915_gem_setup(obj, args->size);
if (ret)
goto object_free;
@@ -129,6 +164,7 @@ i915_gem_create_ioctl(struct drm_device *dev, void *data,
struct drm_i915_private *i915 = to_i915(dev);
struct drm_i915_gem_create *args = data;
struct drm_i915_gem_object *obj;
+ struct intel_memory_region *mr;
int ret;
i915_gem_flush_free_objects(i915);
@@ -137,10 +173,10 @@ i915_gem_create_ioctl(struct drm_device *dev, void *data,
if (!obj)
return -ENOMEM;
- ret = i915_gem_setup(obj,
- intel_memory_region_by_type(i915,
- INTEL_MEMORY_SYSTEM),
- args->size);
+ mr = intel_memory_region_by_type(i915, INTEL_MEMORY_SYSTEM);
+ object_set_placements(obj, &mr, 1);
+
+ ret = i915_gem_setup(obj, args->size);
if (ret)
goto object_free;
@@ -156,7 +192,144 @@ struct create_ext {
struct drm_i915_gem_object *vanilla_object;
};
+static void repr_placements(char *buf, size_t size,
+ struct intel_memory_region **placements,
+ int n_placements)
+{
+ int i;
+
+ buf[0] = '\0';
+
+ for (i = 0; i < n_placements; i++) {
+ struct intel_memory_region *mr = placements[i];
+ int r;
+
+ r = snprintf(buf, size, "\n %s -> { class: %d, inst: %d }",
+ mr->name, mr->type, mr->instance);
+ if (r >= size)
+ return;
+
+ buf += r;
+ size -= r;
+ }
+}
+
+static int set_placements(struct drm_i915_gem_create_ext_memory_regions *args,
+ struct create_ext *ext_data)
+{
+ struct drm_i915_private *i915 = ext_data->i915;
+ struct drm_i915_gem_memory_class_instance __user *uregions =
+ u64_to_user_ptr(args->regions);
+ struct drm_i915_gem_object *obj = ext_data->vanilla_object;
+ struct intel_memory_region **placements;
+ u32 mask;
+ int i, ret = 0;
+
+ if (args->pad) {
+ drm_dbg(&i915->drm, "pad should be zero\n");
+ ret = -EINVAL;
+ }
+
+ if (!args->num_regions) {
+ drm_dbg(&i915->drm, "num_regions is zero\n");
+ ret = -EINVAL;
+ }
+
+ if (args->num_regions > ARRAY_SIZE(i915->mm.regions)) {
+ drm_dbg(&i915->drm, "num_regions is too large\n");
+ ret = -EINVAL;
+ }
+
+ if (ret)
+ return ret;
+
+ placements = kmalloc_array(args->num_regions,
+ sizeof(struct intel_memory_region *),
+ GFP_KERNEL);
+ if (!placements)
+ return -ENOMEM;
+
+ mask = 0;
+ for (i = 0; i < args->num_regions; i++) {
+ struct drm_i915_gem_memory_class_instance region;
+ struct intel_memory_region *mr;
+
+ if (copy_from_user(®ion, uregions, sizeof(region))) {
+ ret = -EFAULT;
+ goto out_free;
+ }
+
+ mr = intel_memory_region_lookup(i915,
+ region.memory_class,
+ region.memory_instance);
+ if (!mr || mr->private) {
+ drm_dbg(&i915->drm, "Device is missing region { class: %d, inst: %d } at index = %d\n",
+ region.memory_class, region.memory_instance, i);
+ ret = -EINVAL;
+ goto out_dump;
+ }
+
+ if (mask & BIT(mr->id)) {
+ drm_dbg(&i915->drm, "Found duplicate placement %s -> { class: %d, inst: %d } at index = %d\n",
+ mr->name, region.memory_class,
+ region.memory_instance, i);
+ ret = -EINVAL;
+ goto out_dump;
+ }
+
+ placements[i] = mr;
+ mask |= BIT(mr->id);
+
+ ++uregions;
+ }
+
+ if (obj->mm.placements) {
+ ret = -EINVAL;
+ goto out_dump;
+ }
+
+ object_set_placements(obj, placements, args->num_regions);
+ if (args->num_regions == 1)
+ kfree(placements);
+
+ return 0;
+
+out_dump:
+ if (1) {
+ char buf[256];
+
+ if (obj->mm.placements) {
+ repr_placements(buf,
+ sizeof(buf),
+ obj->mm.placements,
+ obj->mm.n_placements);
+ drm_dbg(&i915->drm,
+ "Placements were already set in previous EXT. Existing placements: %s\n",
+ buf);
+ }
+
+ repr_placements(buf, sizeof(buf), placements, i);
+ drm_dbg(&i915->drm, "New placements(so far validated): %s\n", buf);
+ }
+
+out_free:
+ kfree(placements);
+ return ret;
+}
+
+static int ext_set_placements(struct i915_user_extension __user *base,
+ void *data)
+{
+ struct drm_i915_gem_create_ext_memory_regions ext;
+
+ if (copy_from_user(&ext, base, sizeof(ext)))
+ return -EFAULT;
+
+ return set_placements(&ext, data);
+}
+
static const i915_user_extension_fn create_extensions[] = {
+ [I915_GEM_CREATE_EXT_MEMORY_REGIONS] = ext_set_placements,
};
/**
@@ -172,6 +345,7 @@ i915_gem_create_ext_ioctl(struct drm_device *dev, void *data,
struct drm_i915_private *i915 = to_i915(dev);
struct drm_i915_gem_create_ext *args = data;
struct create_ext ext_data = { .i915 = i915 };
+ struct intel_memory_region **placements_ext;
struct drm_i915_gem_object *obj;
int ret;
@@ -189,19 +363,26 @@ i915_gem_create_ext_ioctl(struct drm_device *dev, void *data,
create_extensions,
ARRAY_SIZE(create_extensions),
&ext_data);
+ placements_ext = obj->mm.placements;
if (ret)
goto object_free;
- ret = i915_gem_setup(obj,
- intel_memory_region_by_type(i915,
- INTEL_MEMORY_SYSTEM),
- args->size);
+ if (!placements_ext) {
+ struct intel_memory_region *mr =
+ intel_memory_region_by_type(i915, INTEL_MEMORY_SYSTEM);
+
+ object_set_placements(obj, &mr, 1);
+ }
+
+ ret = i915_gem_setup(obj, args->size);
if (ret)
goto object_free;
return i915_gem_publish(obj, file, &args->size, &args->handle);
object_free:
+ if (obj->mm.n_placements > 1)
+ kfree(placements_ext);
i915_gem_object_free(obj);
return ret;
}
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c
index ea74cbca95be..28144410df86 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c
@@ -249,6 +249,9 @@ static void __i915_gem_free_objects(struct drm_i915_private *i915,
if (obj->ops->release)
obj->ops->release(obj);
+ if (obj->mm.n_placements > 1)
+ kfree(obj->mm.placements);
+
/* But keep the pointer alive for RCU-protected lookups */
call_rcu(&obj->rcu, __i915_gem_free_object_rcu);
cond_resched();
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
index 8e485cb3343c..69d6e54bc569 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
@@ -219,6 +219,12 @@ struct drm_i915_gem_object {
atomic_t pages_pin_count;
atomic_t shrink_pin;
+ /**
+ * Priority list of potential placements for this object.
+ */
+ struct intel_memory_region **placements;
+ int n_placements;
+
/**
* Memory region for this object.
*/
diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
index 5cf6df49c333..05a3b29f545e 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
@@ -842,6 +842,24 @@ static bool can_mmap(struct drm_i915_gem_object *obj, enum i915_mmap_type type)
return true;
}
+static void object_set_placements(struct drm_i915_gem_object *obj,
+ struct intel_memory_region **placements,
+ unsigned int n_placements)
+{
+ GEM_BUG_ON(!n_placements);
+
+ if (n_placements == 1) {
+ struct drm_i915_private *i915 = to_i915(obj->base.dev);
+ struct intel_memory_region *mr = placements[0];
+
+ obj->mm.placements = &i915->mm.regions[mr->id];
+ obj->mm.n_placements = 1;
+ } else {
+ obj->mm.placements = placements;
+ obj->mm.n_placements = n_placements;
+ }
+}
+
#define expand32(x) (((x) << 0) | ((x) << 8) | ((x) << 16) | ((x) << 24))
static int __igt_mmap(struct drm_i915_private *i915,
struct drm_i915_gem_object *obj,
@@ -950,6 +968,8 @@ static int igt_mmap(void *arg)
if (IS_ERR(obj))
return PTR_ERR(obj);
+ object_set_placements(obj, &mr, 1);
+
err = __igt_mmap(i915, obj, I915_MMAP_TYPE_GTT);
if (err == 0)
err = __igt_mmap(i915, obj, I915_MMAP_TYPE_WC);
@@ -1068,6 +1088,8 @@ static int igt_mmap_access(void *arg)
if (IS_ERR(obj))
return PTR_ERR(obj);
+ object_set_placements(obj, &mr, 1);
+
err = __igt_mmap_access(i915, obj, I915_MMAP_TYPE_GTT);
if (err == 0)
err = __igt_mmap_access(i915, obj, I915_MMAP_TYPE_WB);
@@ -1211,6 +1233,8 @@ static int igt_mmap_gpu(void *arg)
if (IS_ERR(obj))
return PTR_ERR(obj);
+ object_set_placements(obj, &mr, 1);
+
err = __igt_mmap_gpu(i915, obj, I915_MMAP_TYPE_GTT);
if (err == 0)
err = __igt_mmap_gpu(i915, obj, I915_MMAP_TYPE_WC);
@@ -1354,6 +1378,8 @@ static int igt_mmap_revoke(void *arg)
if (IS_ERR(obj))
return PTR_ERR(obj);
+ object_set_placements(obj, &mr, 1);
+
err = __igt_mmap_revoke(i915, obj, I915_MMAP_TYPE_GTT);
if (err == 0)
err = __igt_mmap_revoke(i915, obj, I915_MMAP_TYPE_WC);
diff --git a/drivers/gpu/drm/i915/intel_memory_region.c b/drivers/gpu/drm/i915/intel_memory_region.c
index 481a487faca6..d98e8b81d322 100644
--- a/drivers/gpu/drm/i915/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/intel_memory_region.c
@@ -28,6 +28,22 @@ static const struct {
},
};
+struct intel_memory_region *
+intel_memory_region_lookup(struct drm_i915_private *i915,
+ u16 class, u16 instance)
+{
+ struct intel_memory_region *mr;
+ int id;
+
+ /* XXX: consider maybe converting to an rb tree at some point */
+ for_each_memory_region(mr, i915, id) {
+ if (mr->type == class && mr->instance == instance)
+ return mr;
+ }
+
+ return NULL;
+}
+
struct intel_memory_region *
intel_memory_region_by_type(struct drm_i915_private *i915,
enum intel_memory_type mem_type)
diff --git a/drivers/gpu/drm/i915/intel_memory_region.h b/drivers/gpu/drm/i915/intel_memory_region.h
index 7cd8e3d66a7f..d24ce5a0b30b 100644
--- a/drivers/gpu/drm/i915/intel_memory_region.h
+++ b/drivers/gpu/drm/i915/intel_memory_region.h
@@ -97,6 +97,10 @@ struct intel_memory_region {
} objects;
};
+struct intel_memory_region *
+intel_memory_region_lookup(struct drm_i915_private *i915,
+ u16 class, u16 instance);
+
int intel_memory_region_init_buddy(struct intel_memory_region *mem);
void intel_memory_region_release_buddy(struct intel_memory_region *mem);
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 47a47b87380f..d025f7da2735 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -2591,6 +2591,11 @@ struct drm_i915_gem_create_ext {
*
* The (page-aligned) allocated size for the object will be returned.
*
+ * Note that for some devices we have might have further minimum
+ * page-size restrictions(larger than 4K), like for device local-memory.
+ * However in general the final size here should always reflect any
+ * rounding up, if for example using the I915_GEM_CREATE_EXT_MEMORY_REGIONS
+ * extension to place the object in device local-memory.
*/
__u64 size;
/**
@@ -2611,10 +2616,67 @@ struct drm_i915_gem_create_ext {
* If we don't supply any extensions then we get the same old gem_create
* behaviour.
*
+ * For I915_GEM_CREATE_EXT_MEMORY_REGIONS usage see
+ * struct drm_i915_gem_create_ext_memory_regions.
*/
+#define I915_GEM_CREATE_EXT_MEMORY_REGIONS 0
__u64 extensions;
};
+/**
+ * struct drm_i915_gem_create_ext_memory_regions - The
+ * I915_GEM_CREATE_EXT_MEMORY_REGIONS extension.
+ *
+ * Set the object with the desired set of placements/regions in priority
+ * order. Each entry must be unique and supported by the device.
+ *
+ * This is provided as an array of struct drm_i915_gem_memory_class_instance, or
+ * an equivalent layout of class:instance pair encodings. See struct
+ * drm_i915_query_memory_regions and DRM_I915_QUERY_MEMORY_REGIONS for how to
+ * query the supported regions for a device.
+ *
+ * As an example, on discrete devices, if we wish to set the placement as
+ * device local-memory we can do something like:
+ *
+ * .. code-block:: C
+ *
+ * struct drm_i915_gem_memory_class_instance region_lmem = {
+ * .memory_class = I915_MEMORY_CLASS_DEVICE,
+ * .memory_instance = 0,
+ * };
+ * struct drm_i915_gem_create_ext_memory_regions regions = {
+ * .base = { .name = I915_GEM_CREATE_EXT_MEMORY_REGIONS },
+ * .regions = (uintptr_t)®ion_lmem,
+ * .num_regions = 1,
+ * };
+ * struct drm_i915_gem_create_ext create_ext = {
+ * .size = 16 * PAGE_SIZE,
+ * .extensions = (uintptr_t)®ions,
+ * };
+ *
+ * int err = ioctl(fd, DRM_IOCTL_I915_GEM_CREATE_EXT, &create_ext);
+ * if (err) ...
+ *
+ * At which point we get the object handle in &drm_i915_gem_create_ext.handle,
+ * along with the final object size in &drm_i915_gem_create_ext.size, which
+ * should account for any rounding up, if required.
+ */
+struct drm_i915_gem_create_ext_memory_regions {
+ /** @base: Extension link. See struct i915_user_extension. */
+ struct i915_user_extension base;
+
+ /** @pad: MBZ */
+ __u32 pad;
+ /** @num_regions: Number of elements in the @regions array. */
+ __u32 num_regions;
+ /**
+ * @regions: The regions/placements array.
+ *
+ * An array of struct drm_i915_gem_memory_class_instance.
+ */
+ __u64 regions;
+};
+
#if defined(__cplusplus)
}
#endif
--
2.26.3
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